The TimeFrame constructor function is particularly simple and a TimeFrame with default attributes is created as follows:
#include "ast.h" AstTimeFrame *timeframe; ... timeframe = astTimeFrame( "" );
Such a TimeFrame would represent the default coordinate system which is
Modified Julian Date (with the usual units of days) in the International
Atomic Time (TAI) time scale.
AST A Library for Handling World Coordinate Systems in Astronomy